BE556331A

BE556331A -

Info

Publication number: BE556331A
Authority: BE

Description

       

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   La présente invention tonterne un procédé d'agglomé- ration de minerais,   Lui   liant pour la mise en oeuvre de ce procédé, un aggloméré obtenu d'après ce procédé et un procédé pour la préparation du liant précité. 



   La nouveauté de l'invention réside dans le .fait que l'on ajoute, à des   mènerais   finement divisés, un liant formé principalement d'un mélange   finement   divisé d'argile et de chaux, avantageusement de marne, et d'autres constituants. 



  Conformment à l'invention, les autres constituants sont aval   -tageusement   formés d'une solution de sulfates tels que. le sulfate de magnésium, le sulfate de fer, ou des sulfates analogues, dans de l'eau, d'amidon et d'une solution d'hy- droxyde, tel   que   l'hydroxyde de potassium, l'hydroxyde ae sodium ou des hydroxydes analogues, dans de l'eau. Après que ces constituants ont été intimement mélangés avec le   mélan-   ge finement divisé d'argile et de chaux, avantageusement de la marne, on malaxe le mélange et on l'agglomère par   pre s-     sion.   



   Suivant un mode de mise en oeuvre préféré de   l'inven'   -tion, on opère de la manière suivante : 
La marne est broyée en grains de moins de 5 mm. 



  On utilise de la marne ayant une teneur d'environ 50 à 90% de CaCO3. 



   On dissout du sulfate de   magnésium   (MgSO4)   dans \..   l'eau à 50-100 C, à raison de 5 gr de MgSO4par litre (dm3) d'eau. Cette solution de MgSO4 est ajoutée, tout en   mélan-     geant,   à la marne, dans la proportion de l% environ, c'est- à-dire 10 cm3 par   kilo)de     marne..Le   degré d'humidité de la marne avec les additions ne doit pas être   sup@rieur   à 10% environ. 

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   Par ailleurs, on dissout de l'hydroxyde de potassium   (KOH)   dans de l'eau chaude, ceci à raison de 10 gr de KOH par litre   (dm3)   d'eau environ. Cette solution de KOH est ajoutée à de l'amidon tel que l'amidon de sagou, de pomme de terre, de mais, etc...,à raison de 10 gr environ par kilo d'amidon. un ajoute ce mélange à la marne traitée par le MgSO4, ceci à raison   de   20 gr environ par kilo de marne. 



   Le mélange est chauffé à environ 50 . 



   On ajoute au minerai 4 à 6% de ce mélange, calculé par rapport au poids du minerai et on le mélange intimement avecce dernier. 



   Le minerai avec le produit ajoute sont alors trai- tés dans un malaxeur et sont pressés à environ 75 C ou da- vantage dans une presse à agglomérer. 



   Grâce au nouveau liant, la liaison dans l'aggloméré est supérieure à celle obtenue avec les liants connus et les presses ne s'encrassent pas. Les agglomérés ont, en outre, une. surface lisse. 



   L'addition   d'hydroxyde   de potassium à l'amidon aug- mente encore le pouvoir liant de l'amidon. 



   Par ailleurs, on peut encore ajouter, à la masse à agglomérer, environ 0,2% ou un peu plus ou un peu moins de paraffine, comme agent hydrofuge. an raison de la teneur élevée, en chaux, du nouveau liant, les scories obtenus dans les procédés de traitement métallurgique sont de grande valeur pour la préparation   d'en-   grais. 



   Si,à la place de la marne, on utilise un autre mé- lange d'argile et de chaux, on mélange intimement l'argile finement divisée avec la chaux finement divisée et le procédé est mis en   eeuvre   de la même manière que celle que l'on vient de décrire. Dans le mélange   d'argile.. 'et   de chaux, la teneur 

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 en chaux est   d'environ     20   à 60%   en   poids et   la teneur'   en argile est d'environ 80 à 40% en poids. Les autres   consti-   tuants du mélange sont utilisés dans des proportions corres-   pondantes.   Il est évident que l'on peut utiliser divers   mélanges   d'argile et de chaux.

   On peut également utiliser, en même temps que la   tnarne,   d'autres mélanges d'argile et de chaux. 



   Quoique l'on ait décrit des   modes   de mise en oeuvre préférés de l'invention, il est entendu que   d'autres   modes de mise en oeuvre peuvent être envisagés, sans que l'on sorte pour cela, du cadre de l'invention. 
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   The present invention relates to a process for the agglomeration of ores, binding it for carrying out this process, an agglomerate obtained by this process and a process for the preparation of the aforementioned binder.



   The novelty of the invention lies in the fact that one adds, to finely divided leads, a binder formed mainly of a finely divided mixture of clay and lime, advantageously of marl, and other constituents.



  In accordance with the invention, the other constituents are downstream -tagalement formed from a solution of sulfates such as. magnesium sulphate, iron sulphate, or analogous sulphates, in water, starch and a solution of hydroxide, such as potassium hydroxide, sodium hydroxide or analogous hydroxides in water. After these components have been thoroughly mixed with the finely divided mixture of clay and lime, preferably marl, the mixture is kneaded and squeezed.



   According to a preferred embodiment of the invention, the procedure is as follows:
The marl is crushed into grains of less than 5 mm.



  Marl with a content of about 50 to 90% CaCO3 is used.



   Magnesium sulfate (MgSO4) is dissolved in water at 50-100 C, at a rate of 5 g of MgSO4 per liter (dm3) of water. This MgSO4 solution is added, while mixing, with the marl, in the proportion of approximately 1%, that is to say 10 cm3 per kilo) of marl. The degree of humidity of the marl with the additions should not be more than about 10%.

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   Furthermore, potassium hydroxide (KOH) is dissolved in hot water, this at a rate of approximately 10 g of KOH per liter (dm3) of water. This KOH solution is added to starch such as sago, potato, corn starch, etc., at a rate of approximately 10 g per kilogram of starch. one adds this mixture to the marl treated with MgSO4, this at a rate of approximately 20 g per kilo of marl.



   The mixture is heated to about 50.



   4 to 6% of this mixture, calculated on the basis of the weight of the ore, is added to the ore and it is intimately mixed with the latter.



   The ore with the added product is then processed in a kneader and is pressed at about 75 ° C or more in a sinter press.



   Thanks to the new binder, the bond in the chipboard is better than that obtained with known binders and the presses do not clog. The agglomerates have, in addition, a. smooth surface.



   The addition of potassium hydroxide to the starch further increases the binding power of the starch.



   Furthermore, it is also possible to add, to the mass to be agglomerated, approximately 0.2% or a little more or a little less paraffin, as a water-repellent agent. Due to the high lime content of the new binder, the slag obtained in metallurgical treatment processes is of great value for the preparation of fertilizers.



   If, instead of the marl, another mixture of clay and lime is used, the finely divided clay is thoroughly mixed with the finely divided lime and the process is carried out in the same way as that in we have just described. In the mixture of clay .. 'and lime, the content

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 lime is about 20 to 60% by weight and the clay content is about 80 to 40% by weight. The other components of the mixture are used in corresponding proportions. Obviously, various mixtures of clay and lime can be used.

   Other mixtures of clay and lime can also be used at the same time as the starch.



   Although preferred embodiments of the invention have been described, it is understood that other embodiments can be envisaged, without departing for this from the scope of the invention.
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Claims

1.- Process of agglomeration of ores, characterized in that a binder is added to the finely ground ores which, in addition to other constituents, is formed mainly from a finely divided mixture of clay and lime, the mixture being then kneaded and then pressed 2. A method according to claim 1, characterized in that the aforementioned mixture of clay and lime is marl.

3. - Method according to claim 1, characterized in that the binder is formed from a mixture comprising a finely divided mixture of clay and lime (preferably marl), a solution of sulfates such as magnesium sulfate , iron sulfate or the like, in water, starch and a solution of hydroxides such as potassium hydroxide, sodium hydroxide or the like in water.

4. - Process according to claim 3, characterized in that the aforesaid mixture is heated to about 50 and is added to the ores at a rate of about 4 to 6% of binder <Desc / Clms Page number 4> based on the weight of the ores, after which the ores and the added binder are kneaded and agglomerated by pressure at about 75 C 5. - Binder for the implementation of the method according to claim 1, characterized in that it comprises, in addition to other constituents, mainly! a finely divided mixture of clay and lime.

6. A binder for carrying out the process according to claim 2, characterized in that it comprises, in addition to other constituents, mainly finely divided marl.

7. - Binder for the implementation of the method according to claim 3j characterized in that it consists of a mixture comprising a finely divided mixture of clay and lime, preferably marl, a solution of sulfates such as magnesium sulfate, iron sulfate, or the like, in water, starch and a solution of hydroxides, such as potassium hydroxide, sodium hydroxide or a hydroxide analogue, in water.

8. A process for the preparation of binders according to claim 7, characterized in that one adds, while mixing with a finely divided mixture of clay and lime, advantageously marl, magnesium sulfate (or a sulfate analog) dissolved in hot water, and to the mixture of clay and lime treated with sulfate is added starch treated with potassium hydroxide (or a similar hydroxide) dissolved in sodium hydroxide. the water.

9. - Process according to claim 8, characterized in that the magnesium sulphate is dissolved in an amount of about 5 gr per liter (cbn3) of hot water and this solution is added to marl, at a ration of 10 cm3 approximately per kilo of marl while dissolving potassium hydroxide in <Desc / Clms Page number 5> at a rate of approximately 10 g of potassium hydroxide per liter (dm3) of hot water, then this solution is added to starch at a rate of approximately 10 g per each kilogram of starch, 50 g of this mixture being added to each kilo of marl treated with sulphate.

10. Agglomerate, characterized in that it comprises a binder which, in addition to other constituents, is formed mainly of a finely divided mixture of clay and lime.

11.- Agglomerate, characterized in., That it comprises a binder which, independently of other constituents, consists mainly of finely divided marl.

12. - Agglomerate, characterized in that it comprises @ a binder which consists of a mixture comprising a mixture, finely divided of clay and lime, advantageously marl, a solution of sulphates such as sulphate of magnesiwn, iron sulfate, or the like, in water, starch and a solution of hydroxides such as potassium hydroxide, sodium hydroxide or the like, in the water.

13. - Agglomerate according to one or other of claims 10 to 12, characterized in that the binder is found in the agglomerate in the proportion of 4 to 6% relative to the weight of the agglomerate.

14.- Agglomerate obtained by the process according to one or the other of claims 1 to 4.